feat(reactivity): collection iteration should inherit iterator instance methods

[edison1105]

close #12615

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+20 B)	37.9 kB (+5 B)	34.2 kB (+15 B)
vue.global.prod.js	158 kB (+20 B)	57.8 kB (+7 B)	51.5 kB (+65 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.3 kB (+20 B)	18.2 kB (+8 B)	16.6 kB (+16 B)
createApp	54.3 kB (+20 B)	21.1 kB (+7 B)	19.3 kB (+3 B)
createSSRApp	58.4 kB (+20 B)	22.9 kB (+7 B)	20.8 kB (+6 B)
defineCustomElement	59.1 kB (+20 B)	22.7 kB (+7 B)	20.7 kB (+1 B)
overall	68.3 kB (+20 B)	26.3 kB (+10 B)	23.9 kB (+8 B)

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commit: 9f08043

[skirtles-code]

Can this part be removed? I think the inherited method will already return the appropriate this value.